Do medical gas cylinders have to be protected from direct sunlight?

NOTE: All references taken from NFPA 99 – 2012 edition

We get this question from customers with medical gas manifolds installed outdoors sometimes. NFPA 99 addresses this question directly in chapter 11 where it talks about protecting gas cylinders stored outdoors:

Note: sub-paragraph (3) Cylinders stored in the open shall be protected as
(1) Against extremes of weather and from the ground beneath
to prevent rusting
(2) During winter, against accumulations of ice or snow
(3) During summer, screened against continuous exposure
to direct rays of the sun in those localities where extreme
temperatures prevail

If you have a gas manifold installed outdoors then you need to ask yourself this question: am I in a location where extreme temperatures prevail?  If the answer is yes then you should take steps to protect those gas cylinders from direct sunlight, if the answer is no then maybe you’re fine.  Keep in mind that the AHJ (Authority Having Jurisdiction) will ultimately determine if you’re in a location where extreme temperatures prevail.  It may be worth asking your AHJ what they think if you have the relationship with them where that is feasible.

Sub-paragraph (1) & (2) from this reference should not be ignored either.  Rust on cylinders is a common problem so ensure that your concrete pad is well drained and free of dirt & mud.  Ice & snow buildup can be a major issue in the northern states, being diligent and keeping the pad clear so that it can be navigated by personnel is important after a big snowstorm.

If you have any further questions regarding outdoor cylinder storage or any other aspect of NFPA 99 please give us a call at 1-888-256-EMGS (3647)

Rebuilding Amico & Beacon Medaes Outlets (Series B style, Diamond style quick connect)

When you have a hospital of any age it is likely that you probably have outlets manufactured by more than one company. When this happens you may get outlet repair parts mixed up especially in the case of Amico and Beacon (Series B) style outlets. If you’ve ever rebuilt the latch valve of one of these outlets and noticed that you fixed the leak but created a flow problem (low or no flow) the reason is because of the dust cap used by Amico and Beacon Medaes.

At first glance they appear to be identical, but upon further inspection you will notice subtle differences in each one. Amico has two different styles that come in their standard repair kit, a white cap and a gray cap. The gray cap can be put aside because we are talking specifically about Ohmeda/Medaes Diamond style quick connect outlets. The gray dust cap is specifically for Chemetron (Allied Healthcare) style vacuum inlets.

In the picture below you will note a couple of key differences. The front of the Beacon Medaes dust cap has three lines that meet in the middle to form a triangle. The Amico dust cap is flat with no texture. If you look at the back you will notice another key difference and this is what can cause flow issues. The Amico has a raised portion on the inside front of the dust cap, but the raised portion is solid. The Beacon Medaes dust cap also has a raised portion but it is hollow and has a hole in the middle, this allows the brass poppet to seat slight further within the barrel than on the Amico latch valve. That is why mixing the dust caps can cause no flow issues when Amico dust caps are used on Beacon Medaes outlets.

The moral of the story is be sure to keep your outlet parts segregated and use the appropriate manufacturer repair parts for each individual outlet or inlet.





NFPA 99 Zone Valve Labeling – New Construction vs. Existing Facilities

Zone Valve Box

There are two types of zone valve references that address labeling in NFPA 99 (2012 edition). One is for new construction projects which is located here:

  • Zone valves shall be labeled in accordance with
  • Shutoff Valves.
  • Shutoff valves shall be identified with the following:
    (1) Name or chemical symbol for the specific medical gas or
    vacuum system
    (2) Room or areas served
    (3) Caution to not close or open the valve except in emergency
  • Where positive pressure gas piping systems operate at
    pressures other than the standard gauge pressure of 345 kPa to
    380 kPa (50 psi to 55 psi) or a gauge pressure of 1100 kPa to
    1275 kPa (160 psi to 185 psi) for nitrogen or instrument air, the
    valve identification shall also include the nonstandard operating


The other reference is for existing facilities (which apply during projects such as the annual testing we perform), and that reference is located here:

(NOTE: The * next to Valves indicates that there is additional information available in the annex material. The annex isn’t “technically” enforceable however many inspectors do not seem to care because they enforce items out of the annex all of the time. Zone valves aren’t directly mentioned in this section of chapter 5, just in the annex of chapter 5.)

  • General. The elements in through
    5.1.15 shall be inspected or tested as part of the maintenance
    program as follows:
    (8)*Valves — labeling

The * refers to:

  • A. Additional inspections for zone valves include
    the following:
    (1) Locations (relationship to terminals controlled)
    (2) Leaks
    (3) Labeling
    (4) Housekeeping around alarm

NFPA 99 2012 Medical Gas Outlet Testing Requirements – Existing Facilities

NOTE: All references are taken from NFPA 99 – 2012 edition


There seems to be much confusion over the requirements set out by NFPA 99 for existing facilities vs. those for new construction / renovation work.  The 2012 edition of NFPA 99 has done a great deal to clear some of this up. Subsection 5.1.2 through and
shall apply to new health care facilities or facilities making
changes that alter the piping. Paragraph through and 5.1.13
through 5.1.15 shall apply to existing health care facilities.

NFPA 99 doesn’t mention a specific schedule for medical gas outlet testing on existing outlets, it just says periodic.  The healthcare facility will need to make a policy that says how often the med gas outlets get checked (i.e. every three years etc) and adhere to that.

The section of NFPA 99 that specifies all outlets / inlets must be checked falls under the new construction / renovation portion.  (5.1.5* Station Outlets/Inlets.)  These requirements as they are written in 5.1.5 are not intended to be applied to existing healthcare facilities.

The medical gas outlet testing section for 5.1.14 is as follows: Maintenance of Medical Gas, Vacuum, WAGD, and
Medical Support Gas Systems.* General.
Health care facilities with installed medical
gas, vacuum,WAGD, or medical support gas systems, or combinations
thereof, shall develop and document periodic maintenance
programs for these systems and their subcomponents as appropriate
to the equipment installed. General. The elements in through
5.1.15 shall be inspected or tested as part of the maintenance
program as follows:
(11)*Station outlets/inlets, as follows:
(a) Flow
(b) Labeling
(c) Latching/delatching
(d) Leaks

Remember that the * next to (11) refers to additional material which is located in the annex  of NFPA 99.  In this case A. simply states that the outlets should be inspected for a general condition & be gas specific (noninterchangeable indexing).

Annex material is not enforceable as code and is meant for reference only however, that doesn’t mean that an AHJ (Authority Having Jurisdiction) will not use annex material for a given facility or situation.  Just be aware of the additional requirements located in the annex for this section and take them into consideration when doing your risk assessments and writing your medical gas outlet testing policy.